Name: Rd Raud to focus light on the tooth of a patient 1. Dentists use a A conca

Question

Name: Rd Raud to focus light on the tooth of a patient 1. Dentists use a A concave mirror B convex mirror C plane mirror D. cylindrical mirror 2. What is the bending of light rays, due to a change in speed as the rays pass through a substance, called ? A. A. Reflection B. Refractiorn C. Diffiusion D. Diffraction Object 3.What type lens is this? A. Convex B. Concave C. Plane D. Parabolic 4. Which type of mirror makes objects appear smaller, but the area of view larger? A. Convex B. Concave C. Parabolic D. Plane

Explanation / Answer

A dentist uses a CONCAVE mirror. He places the mirror behind the tooth so that the tooth is within the focal length of the mirror. The image created by the reflection is an enlarged virtual image, allowing the dentist to see the detail in the tooth.

2 - Refraction is the bending of light rays due to change in speed due to change in the medium through which rays passes out.

3 and 4- A concave lens produces diminished (small), upright and virtual image of the object in front of it.as shown in figure.

Hence correct answer for 3 and 4 is concave lens.

Hence .

For 3 and option (B) is correct.

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